1 files changed, 87 insertions, 0 deletions
diff --git a/ttysize.c b/ttysize.c
new file mode 100644
index 000000000000..f38708908ed8
--- /dev/null
+++ b/ttysize.c
@@ -0,0 +1,87 @@
+/*
+ *  $Id: ttysize.c,v 1.1 2018/06/09 02:03:03 tom Exp $
+ *
+ *  ttysize.c -- obtain terminal-size for dialog
+ *
+ *  Copyright 2018	Thomas E. Dickey
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License, version 2.1
+ *  as published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful, but
+ *  WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this program; if not, write to
+ *	Free Software Foundation, Inc.
+ *	51 Franklin St., Fifth Floor
+ *	Boston, MA 02110, USA.
+ *
+ *  An earlier version of this program lists as authors
+ *	Savio Lam (lam836@cs.cuhk.hk)
+ */
+
+#include <dialog.h>
+
+/*
+ * This is based on work I did for ncurses in 1997, and improved/extended for
+ * other terminal-based programs.  The comments are from my original version -TD
+ */
+
+#ifdef HAVE_TERMIOS_H
+#include <termios.h>
+#endif
+
+#ifdef HAVE_SYS_IOCTL_H
+# include <sys/ioctl.h>
+#endif
+
+#ifdef NEED_PTEM_H
+ /* On SCO, they neglected to define struct winsize in termios.h -- it's only
+  * in termio.h and ptem.h (the former conflicts with other definitions).
+  */
+# include <sys/stream.h>
+# include <sys/ptem.h>
+#endif
+
+/*
+ * SCO defines TIOCGSIZE and the corresponding struct.  Other systems (SunOS,
+ * Solaris, IRIX) define TIOCGWINSZ and struct winsize.
+ */
+#if defined(TIOCGSIZE)
+# define IOCTL_WINSIZE TIOCGSIZE
+# define STRUCT_WINSIZE struct ttysize
+# define WINSIZE_ROWS(n) (int)n.ts_lines
+# define WINSIZE_COLS(n) (int)n.ts_cols
+#elif defined(TIOCGWINSZ)
+# define IOCTL_WINSIZE TIOCGWINSZ
+# define STRUCT_WINSIZE struct winsize
+# define WINSIZE_ROWS(n) (int)n.ws_row
+# define WINSIZE_COLS(n) (int)n.ws_col
+#else
+# undef HAVE_SIZECHANGE
+#endif
+
+int
+dlg_ttysize(int fd, int *high, int *wide)
+{
+    int rc = -1;
+#ifdef HAVE_SIZECHANGE
+    if (isatty(fd)) {
+	STRUCT_WINSIZE size;
+
+	if (ioctl(fd, IOCTL_WINSIZE, &size) >= 0) {
+	    *high = WINSIZE_ROWS(size);
+	    *wide = WINSIZE_COLS(size);
+	    rc = 0;
+	}
+    }
+#else
+    high = 24;
+    wide = 80;
+#endif /* HAVE_SIZECHANGE */
+    return rc;
+}